Instruction/ maintenance manual of the product SR554 SRS Labs
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Model SR554 Transformer Preamplifier.
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Model SR554 Transformer Preamplifier 1290-D Reamwood Avenue Sunnyvale, California 94089 Phone: (408) 744-9040 • Fax: (408) 744-90 49 email: info@thinkSRS.
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1 SR554 SPECIFICATIONS Inputs Single ended or differential Input Impedance 0.5 Ω Maximum Inputs Transformer and Buffer: 14.0 mV RMS (±20 mV peak) Transformer only: 350 mV RMS (±0.
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3 OPERATION The SR554 Transformer Preamplifier is designed to be used with all SRS Lock-in amplifiers. It can reduce input noise of a lock-in amplifier dramatically (as low as 100 pV/ √ Hz) and extends the lock-in’s full scale sensitivity (without expand).
4 1.6 µ F. The real portion of the input impedance (0.5 Ω ) determines the noise performance. See page 7 for detailed information on input impedance. The input can be floated up to ±100 VDC with respect to the chassis. The maximum AC input before overload is 14 mV RMS (±20 mV peak) when the unit is in the buffered mode.
5 the differential mode. In differential operation the (A) and (B) center conductors carry the signal and shielded preamp ground, and the shields are tied to the SR554 chassis. The (A) and (B) cables should be twisted together to prevent inductive pick-up.
6 EXTRA LOW NOISE MEASUREM ENTS When making extremely low noise measurements, it is a good practice to connect the grounding plug of the SR554 to a ground point near the experiment.
7 USING THE SR554 WITHOUT AN SRS LOCK-IN The SR554 can be powered with an external power supply. Power is applied through the 9 pin connector as described below. PIN VOLTAGE CURRENT 1 +20 V 100 mA 6 -20 V 100 mA 7,8 Ground Both voltages are required. Pins 7 and 8 should be tied together and grounded.
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9 PERFORMANCE TESTS Performance tests are designed to verify that the unit is performing within the specifications. Necessary Equipment: 1. Lock-In Amplifier Freq Range 0.1 Hz - 100 kHz Output Ampl 4 mV rms - 1 Vrms Output Z 50 Ω Recommended SRS SR850/830/810 2.
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Part List 11 Ref. SRS part Value Description C 101 5-00254-501 130P Capacitor, Ceramic Di sc, 50V, 10%, SL C 102 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U C 103 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U C 104 5-00005-501 150P Capacitor, Ceramic Di sc, 50V, 10%, SL C 105 5-00023-529 .
Part List 12 Ref. SRS part Value Description Z 0 0-00043-011 4-40 KEP Nut, Kep Z 0 0-00079-031 4-40X3/16 M/F Standoff Z 0 0-00089-033 4" Tie Z 0 0-00128-053 4" #24 Wire #24 UL1007 Strip 1/4x.
An important point after buying a device SRS Labs SR554 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought SRS Labs SR554 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data SRS Labs SR554 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, SRS Labs SR554 you will learn all the available features of the product, as well as information on its operation. The information that you get SRS Labs SR554 will certainly help you make a decision on the purchase.
If you already are a holder of SRS Labs SR554, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime SRS Labs SR554.
However, one of the most important roles played by the user manual is to help in solving problems with SRS Labs SR554. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device SRS Labs SR554 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
